They provide a way to share information in nonprint media. :)
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According to the Dietary Guidelines for Americans 2015–2020 , a healthy eating plan: Emphasizes fruits, vegetables, whole grains, and fat-free or low-fat milk and milk products. Includes lean meats, poultry, fish, beans, eggs, and nuts.
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Hope this helps
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Maybe yes because if u have 100 people and ur stuck on an island, You can set up a civilisation over there an live by yourself with ur group and set up a different way of living